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It takes 65 seconds for a train to pass through a 1000 meter bridge and 50 seconds if it passes through a 730 meter tunnel at the same speed. Find the forward speed and length of the train
The vehicle speed is: (1000-730) ÷ (65-50),
=270÷15，
=18 (M / s),
Conductor: 18 × 65-1000，
=1170-1000，
=170 (m),
A: the speed of the train is 18 meters per second, and the length of the train is 170 meters
A 470 meter long train passes through a 1030 meter long bridge in 1 minute and 20 seconds, and then passes through a tunnel in 40 seconds at the same speed. How long is the tunnel?
1 minute, 20 seconds = 80 seconds,
[（470+1030）÷80] × 40-470
=18.75 × 40-470
=750-470
=280 (m);
A: the tunnel is 280 meters long
A 470 meter long train passes through a 1030 meter long bridge in 1 minute and 30 seconds and a tunnel in 45 seconds at the same speed. How long is the tunnel
V car = s car / T car = 470m + 1030m / 90s = 50 / 3 M / S
S Tunnel + s car = t Car * V car = 45s * 50 / 3 M / S = 750m
S Tunnel = 750m-470m = 280m
A 490 meter long train passes through a 1030 meter long bridge in 1 minute and 20 seconds, and then passes through a tunnel in 40 seconds at the same speed. How long is the tunnel?
The length of the bridge + the length of the train in front of the bridge + the length of the train under the bridge is the train completely passing through the bridge, so the bridge length + 2 train length / 2 is the speed of the train passing through the bridge. The time of passing through the tunnel is 1 / 2 of the time of passing through the bridge, so the tunnel length is 1 / 2 of the bridge length + 2 train length
A 470 meter long train passes through a 1030 meter bridge in 1 minute and 30 seconds, and then passes through a tunnel in 45 seconds at the same speed. How long is the tunnel
1030 + 470 = 1500m
The train speed is 1500 / 90 = 50 / 3 M / s
The tunnel length plus the train length is 50 / 3 * 45 = 750 meters
Tunnel length = 750-470 = 280m
A 470 meter long train passes through a 1030 meter long bridge in 1 minute and 30 seconds and a tunnel in 45 seconds at the same speed. How long is the tunnel?
1 minute 30 seconds = 90 seconds. Because the speed is the same, it can be known from the time of passing through the bridge and the time of passing through the tunnel,
The distance traveled by the train through the bridge is 90 ÷ 45 = 2 times that through the tunnel, so
When the train passes through the tunnel, the distance should be (470 + 1030) ÷ 2 = 750 (m),
750-470 = 280 (m), so the tunnel length of 280 M can be obtained
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